Flat drill bit



FIG. 1 is a perspective view of a flat drill bit showing the new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a perspective view of a flat drill bit as a whole thereof.

The evenly-spaced broken lines illustrate portions of the flat drill bitthat form no part of the claimed design.

CLAIM The ornamental design for a flat drill bit, as shown anddescribed.